The latest word from Patrick Ma at TAD suggests that, due to the excessive amount of hand fitting required to maintain these ultra precise tolerances, the base price for the semi-production model could possibly be sneaking closer to the $1000 mark as we speak.
Paul,
I'm afraid I'm not the best one to try to explain the D/A OTF mechanism. Still, never having been one to be bashful about hopelessly confusing people, I will give it my best shot.
As I understand it, the key to this mechanism is the firing button. This button does more than simply fire a spring (as with most single action autos). Rather, as you slide the firing button forward on the D/A model, initially this motion does nothing but place tension on the firing spring (which was under almost no tension prior to this point). It's only at the very end of the forward movement of the firing button (after sufficient tension has been placed on the spring) that the blade is actually released and allowed to move forward. At this point the blade locks into the forward position, and the tension on the firing spring is back to near zero.
When you want to retract the blade, you obviously begin by moving the firing button in the opposite (or rearward) direction. It's the same button, but you can now think of it as the blade "retraction" button. As the button begins this rearward movement, once again you are initially doing absolutely nothing but tensioning a spring. Only in this case the spring you're tensioning is a separate blade retraction spring that resides internally on the opposite side of the button from the blade firing spring. It works just the same as the blade firing spring, differing only in that it fires the blade back into the handle. And once again, the blade is held firmly in place until the very end of the button's rearward movement (once the spring has been fully tensioned). At this point the blade fires back into the handle and locks into place. This blade movement releases the tension from the retraction spring, and the knife is ready to go through the cycle all over again.
There, that should make things as clear as mud.
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Semper Fi
-Bill